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Red Blood Cell Transfusion Thresholds for Anemia of Prematurity
Lindsay F Holzapfel1,2, Matthew A Rysavy1,2, Edward F Bell3
1McGovern Medical School at University of Texas Health Science Center, Houston, TX.
Insights
Lower versus higher red blood cell transfusion thresholds do not impact neurodevelopmental outcomes in preterm infants. This review examines anemia of prematurity causes, treatments, and transfusion threshold evidence.
Area of Science:
- Neonatal Medicine
- Pediatric Hematology
Background:
- Anemia of prematurity affects most preterm infants, especially those with extremely low birth weight.
- It necessitates red blood cell transfusions in over 80% of extremely preterm infants within the first month.
- Causes are both innate and iatrogenic, highlighting the need for effective management.
Approach:
- This review synthesizes evidence from multiple randomized controlled trials (RCTs) on red blood cell transfusion thresholds.
- It critically examines the history and findings of RCTs investigating lower versus higher hemoglobin thresholds.
- The review also addresses the etiology, prevention, and treatment of anemia of prematurity.
Key Points:
- RCTs comparing lower and higher red blood cell transfusion thresholds found no significant difference in neurodevelopmental impairment at 2 years.
- Evidence suggests current transfusion thresholds may not influence long-term neurodevelopmental outcomes.
- Despite findings, uncertainties regarding optimal transfusion thresholds persist.
Conclusions:
- The current evidence base indicates no clear benefit of higher red blood cell transfusion thresholds for neurodevelopmental outcomes in preterm infants.
- Further research is needed to address remaining questions and refine transfusion guidelines.
- Understanding the limitations of existing evidence is crucial for future clinical practice and research.
Abstract:
Anemia of prematurity affects the majority of preterm infants, particularly extremely low birthweight infants. Anemia of prematurity arises from both innate and iatrogenic causes and results in more than 80% of extremely preterm infants receiving red blood cell transfusions during the first month after birth. Multiple randomized controlled trials were conducted to evaluate the effect of using lower versus higher transfusion thresholds based on hemoglobin levels. These trials showed no difference in the primary outcome of neurodevelopmental impairment at 2 years of age between lower and higher thresholds. However, some uncertainties about transfusion thresholds remain. This review elaborates the following: 1) the etiology, prevention, and treatment of anemia of prematurity with a focus on red blood cell transfusions, 2) the history of randomized controlled trials on the treatment of anemia of prematurity, and 3) limitations of the evidence and remaining questions about thresholds for red blood cell transfusions in preterm infants.
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